Replace StatusOr<T> with Result<T>

Bug: 133494354
Test: builds successfully
Test: atest apexservice_test
Change-Id: I49bd2797106fdc91205e76222120ce98ea021ecd
Merged-In: I49bd2797106fdc91205e76222120ce98ea021ecd
(cherry picked from commit 137fc81fb2346aa5f9cce9360cd78167b98f8487)
1 file changed